Apparatus for cooling the mandrels of tube-rolling mills



' IIILLS H. IDEL Oct. 22, 1929.

APPARATUS ran boonnw THE MANDRELS OF TUBE ROLLING Filed une 16. 1927 2 QE J, n l m J Q E a VY k. 2 J f j w. a E E wm h- Q a 4 (m h m 3 N- I.I..|.| ga l-l I I I I I I I I I I l I I I I l II P .N 3 v atented a.22, 1929 TES UNITED STA PATENT OFFICE HEBMANN IDEL, OF DUISBUBG,GERMANY, ASSIGNOR TO DEMAG. AKTIENGESELL- SCHAFT, OF DUISBUBG, GERMANY vAPPARATUS FOR COOLING THE MANDRELS OF TUBE-ROLLING MILLS Applicationfiled June 16, 1927, Serial No.

'lhe etl'ective operation of tube rolling mills requires that themandrels employed be continuously cooled, because they are subjected bythe work to very exceptional degrees of heat. For this purpose themandrels are made hollow and are subjected to the action ot' circulatingcooling water during operation.

According to the invention an apparatus is provided in such manner thatwhen the mandrel is advanced into the working position it isautomatically put into communication with the water teed pipe, andimmediately thereupon it actuates a closure 1nen1- her, which admitswater to the mandrel. Vice versa, the pipe connections are broken on thereturn of the mandrel after each working operation, and at the same timethe inlet for the water is closed.

According to the invention, moreover, a valve is provided on thestationary bed and is held in closed position by means "of a spring, andthe valve is provided with a tubular extension serving also as a guidefor the valve, the extension being adapted to contact with a mouthpiecewhen the mandrel is advanced, the mouthpiece forcing the valve back toopen it and thereby to allow the watcr to flow through to the mandrel.

One form of apparatus according to the invention is illustrated in theaccompanying drawing in its application to a mill with in: clined rolls.

in the drawings:

Figure 1 illustrates the apparatus in longitudinal section;

Figure 2 is a-partial plan corresponding to Figure l, and

Figure 2-3 shows an important part of the apparatus on an enlarged scalein longitudinal scction.

1 is one of the two-inclined rolls which work together with the head 2on the mandrel which is hollow. The rear end of the hollow mandrel 3 isconnected in known manner by screw threaded parts to the head 4 whichcan be advanced or retracted and which is held in known manner by theabutment 5 in the working position. The head or hearing 4 is secured andreleased as shown 199,381, and in Germany April 12, 1927.

in the drawing on movement of the abutment 5 by means of a pneumatic orhydraulic device 6. The head or bearing at is connected to aJ'ack 7which is disposed parallel below the mandrel, and in which engages thetoothed pinion 8 driven by a motor. Adjacent the head or bearing 4, avalve casing 10 is secured on the bed 9, in which the valve member 11 issubject to the action of the spring 23 which has for its object tomaintain the valve member ll closed (Figures 3 and 2) The water feedpipe 12 is connected to the valve casing 10 and at the rear of the valvemember 11 a tubular member 13 is provided through which the waterpasses, the tubular member 13 being connected to the valve member 11 toserve as a guideand to pass through the stuliing box 14 provided at theend of the valve casing 10. When the valve member 11 is in the openposition il-' lustrated in Figure 3, water passes through the slots 15into the bore of the tubular member 13. The free end of the tubularmember 13 is provided wit-h a conical mouthpiece 16 which in the workingposition of the mandrel 3 is pressed tight against a packing or seatingring 17 mounted in the casing 18. Passages 19 are provided in the casing18, and connected with the bent: pipe 20, the end 21 of which passesinto the mandrel 3. When the valve member 11 closes upon its seat thesupply of water is cut off.

The manner of operation of the cooling apparatus will be readilyunderstood from the foregoing description and the drawing. The apparatusoperates as follows When the mandrel 3 is in the retracted position thehead 4 is also drawn back with the casing 18 away from the mouthpiece 16so that the valve member 11 is held in the closed position under theaction of the spring 23. As the mandrel 3 is advanced the packing orseating ring 17 presses against the conical head 16 of the tubularmember 13 and forces it back (see Figure 3), so that the cooling waterflows from the pipe 12 through the slots 15 into the pipe 13. Thecooling water leaves this pipe 13 and passes through the passages 19into the pipe 20 and thence, as shown in the drawing, into the mandrel3, thereupon the on the mandrel reaching its working within water passesagain into the head 4 through the annular passage surrounding the pipe20 and is carried away along the channel 22.

' The use of the invention is not confined to the constructionillustrated, but may be used generally for tube rolling mills.

I claim:

1. Means for cooling mandrels of tube rolling mills consisting incombmation of a mandrel adapted to be cooled and having an inlet for thecooling liquid, means for causin the movement of the mandrel into andout o? the working position and means operable onl os1- tion for theadmission of the cooling li quid into the said inlet.

2. An apparatus for cooling mandrels oftube rolling mills consisting incombination of a mandrel adapted to be retracted from its workingposition and to be cooled, a head which the said mandrel is supportedsaid head comprising a mouthpiece for the admission of the coolingliquid, and a stationary spring closed valve adapted by a hollowextension to be opened on contact with the said mouthpiece for assageofthe cooling liquid through the sai extension to the mandrel.

HERMANN IDEL.

